f--k ffff ffii ffrr ffss fiff fifi fiii fiki firk firs fisi fisk fiss frik fris fsfi fssf ifis ifrf ifri iiii iiis iirs iisi iisr ikki ikri iri- iris irki irks irri irrs irsf isis iskf isri issf issi issr isss kfff kffk kfir kfis kfri kfrr kfrs kfsi kfsk kfsr kiff kifr kifs kiii kiik kiis kikf kiki kikk kikr kirf kiri kirk kirr kirs kisf kisi kisk kisr kiss kkfi kkfr kkfs kkik kkkk kkrf kkrk kkrr kkrs kksf kksi kksr kkss krff krfs krik kris krki krkk krkr krks krrf krri krrk krrr krrs krsf krsk krsr krss ksfi ksfr ksif ksii ksik ksir ksis kskf kskk kskr ksks ksrf ksrr ksrs kssi kssr ksss riff rifs riif riis riki rikk riri rirs risi risk riss rkkf rkss rrif rrrr rsis s-ii sfss siff sifr siik siki sikr siks sirf siri sirk sirr sirs sisi sisk siss skif skik skir skis skss srfi sris ssis ssri ssrs sssf sssi ssss